BIOGEN INC. — All Filings
1,000 total filings on record
Public companies registered with the SEC are required to file periodic reports, disclosures, and notices throughout the year. The most important are the 10-K (annual report), 10-Q (quarterly report), and 8-K (material event notice). Use the filters below to narrow by form type.
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UPLOAD
| Form | Description | Accession Number | Filed | Period |
|---|---|---|---|---|
| SCHEDULE 13G/A | — | 0000102909-26-000745 | Mar 26, 2026 | — |
| 8-K | CURRENT REPORT | 0000950157-26-000280 | Mar 11, 2026 | — |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000035 | Feb 17, 2026 | Feb 13, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000034 | Feb 17, 2026 | Feb 13, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000033 | Feb 17, 2026 | Feb 12, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000032 | Feb 17, 2026 | Feb 13, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000031 | Feb 17, 2026 | Feb 13, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000030 | Feb 17, 2026 | Feb 13, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000029 | Feb 17, 2026 | Feb 13, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000028 | Feb 17, 2026 | Feb 13, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000027 | Feb 17, 2026 | Feb 13, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000026 | Feb 17, 2026 | Feb 13, 2026 |
| 8-K | 8-K | 0001193125-26-046803 | Feb 11, 2026 | — |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000024 | Feb 10, 2026 | Feb 6, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000023 | Feb 10, 2026 | Feb 6, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000022 | Feb 10, 2026 | Feb 6, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000021 | Feb 10, 2026 | Feb 6, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000020 | Feb 10, 2026 | Feb 6, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000019 | Feb 10, 2026 | Feb 6, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000018 | Feb 10, 2026 | Feb 6, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000017 | Feb 10, 2026 | Feb 6, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000016 | Feb 10, 2026 | Feb 6, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000015 | Feb 10, 2026 | Feb 6, 2026 |
| 144 | — | 0001959173-26-000739 | Feb 9, 2026 | — |
| 10-K | 10-K | 0000875045-26-000013 | Feb 6, 2026 | Dec 31, 2025 |
| 8-K | 8-K | 0000875045-26-000011 | Feb 6, 2026 | — |
| SCHEDULE 13G | — | 0000315066-26-000383 | Feb 5, 2026 | — |
| 4 | PRIMARY DOCUMENT | 0000875045-26-000007 | Feb 3, 2026 | Jan 30, 2026 |
| 144 | — | 0001959173-26-000517 | Feb 2, 2026 | — |
| 8-K | 8-K | 0000875045-26-000003 | Jan 14, 2026 | Jan 13, 2026 |
| 4 | PRIMARY DOCUMENT | 0000875045-25-000052 | Dec 3, 2025 | Dec 1, 2025 |
| SCHEDULE 13G/A | — | 0000763212-25-000007 | Nov 13, 2025 | — |
| 4 | PRIMARY DOCUMENT | 0000875045-25-000051 | Nov 4, 2025 | Oct 31, 2025 |
| 10-Q | 10-Q | 0000875045-25-000049 | Oct 30, 2025 | Sep 30, 2025 |
| 8-K | 8-K | 0000875045-25-000047 | Oct 30, 2025 | — |
| 8-K | 8-K | 0000875045-25-000040 | Oct 14, 2025 | — |
| 4 | PRIMARY DOCUMENT | 0000875045-25-000037 | Oct 6, 2025 | Oct 2, 2025 |
| 4 | PRIMARY DOCUMENT | 0001127602-25-021083 | Sep 2, 2025 | Aug 29, 2025 |
| 144 | — | 0001959173-25-005676 | Sep 2, 2025 | — |
| 8-K | 8-K | 0000875045-25-000035 | Jul 31, 2025 | — |
| 10-Q | 10-Q | 0000875045-25-000033 | Jul 31, 2025 | Jun 30, 2025 |
| SCHEDULE 13D/A | — | 0000950157-25-000596 | Jul 30, 2025 | — |
| SCHEDULE 13D/A | — | 0000950157-25-000586 | Jul 21, 2025 | — |
| 4 | PRIMARY DOCUMENT | 0001127602-25-019295 | Jul 16, 2025 | Jul 8, 2025 |
| 144 | — | 0001959173-25-004498 | Jul 8, 2025 | — |
| 8-K | 8-K | 0000875045-25-000027 | Jul 7, 2025 | — |
| 8-K | 8-K | 0000875045-25-000023 | Jun 23, 2025 | Jun 17, 2025 |
| 4 | PRIMARY DOCUMENT | 0001127602-25-017767 | Jun 18, 2025 | Jun 17, 2025 |
| 4 | PRIMARY DOCUMENT | 0001127602-25-017766 | Jun 18, 2025 | Jun 17, 2025 |
| 4 | PRIMARY DOCUMENT | 0001127602-25-017765 | Jun 18, 2025 | Jun 17, 2025 |